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Try to reset the monitor to factory default setting, I did experience this before on an old monitor, where it was just flickering for a while then will be back to normal once no incoming / outgoing activity from the handphone.

The guy has another (Samsung) monitor next to the BenQ one and the Samsung does not get affected by the mobile phones.

I went out to him today and I did a simple test; I disconnected the DP from the BenQ and took the VGA from the Samsung connected it to the BenQ....and problem went away.

This to me suggest that it is a problem with the DP cable (even though my vendor insisted its "high-end") - or perhaps its the DP out on the PC?

Available ports:
The PC has VGA and DP out.
The BenQ has VGA, DVI and DP in.
The Samsusng has HDMI and VGA in.

I am thinking the fastest, simplest and cheapest would be to use the VGA on the BenQ (since that is atleast working) and go for either DP -> DVI or DP -> VGA cable from MicroConnect or something for the Samsung.

that is not what i said : you should CONNECT it to that pc - next to it is not the same, as you say yourself :

I went out to him today and I did a simple test; I disconnected the DP from the BenQ and took the VGA from the Samsung connected it to the BenQ....and problem went away.
it can be a cable problem, mut it can be anything else (in the monitor ) as well. (it can still be a bad grounding)

>> go for either DP -> DVI or DP -> VGA cable << if it works , ok, but since you are installing more devices in the line, it could work out either way (better or worse)

>> I disconnected the DP from the BenQ and took the VGA from the Samsung connected it to the BenQ....and problem went away.

There is another possibility, the cable connect from DP to BenQ faulty. If there got another set of monitor with same connection as this case, can be used to test it out. If the other set working well, conclusion will be the cable faulty.

Qlemo: The question is not abandoned. I'm still working on it. The problem is that this client is geographically located far away from me so it is not that easy to test solutions. I will be trying nobus' suggestion and use a DP -> HDMI - but alas not yet.

As for your suggested granting of points to rindi and lauchangkwang. I already posted that their suggestions did *not* help:

rindi: I bought a high-end shielded DP cable and had the customer try it. It did not help.

lauchangkwang: The monitor is brand new. I tried (with BenQ support and the customer on the phone) various settings on the monitor, didnt help I'm afraid.

lauchangkwang's second suggestion is yet to be tested.

So if possible - keep this question open for longer. Need more time to test.

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